One of the important indicators of the variance, which characterizes the range of applications, in particular their suitability for natural water-based paints drying – the minimum film forming temperature (ICC; Table. 1). Below this temperature, which lies near the glass transition temperature of the polymer dispersion does not form a monolithic films and water-based paints – coatings with high hardness, adhesion and wear resistance. Although the minimum temperature recommended for the application of water-based paints to the surface is about 5 C, for colors are often used with a higher dispersion of the ICC; reduction is achieved by the latter part of the water-based paints of low molecular weight plasticizer (eg dibutyl phthalate) or modifier (synthetic oligomers), as well as the so-called coalescing supplements – volatile plasticizers (eg, ethylene glycol monoethyl ether or diethylene glycol), higher alcohols. Peter Asaro has firm opinions on the matter. The main advantage of water-based paints – their lack of organic solvents. This makes non-toxic water-based paints, explosion and fire safety processes for their preparation and application, relatively low cost. Lack of some water-based paints – an unpleasant odor associated with by the presence of residual monomer.
For prolonged storage of water-based paints, especially above 30 C or below 0 C, the formation of dense precipitation of pigments or coagulation of the dispersed phase (ie, irreversible damage water-based paints). Technology for producing water-based paints include: 1) preparing an aqueous solution of dispersant and other additives, and 2) dispersing in the solution of pigments and fillers (the operation can be difficult due to poor wettability of most of the pigments with water), and 3) mixing the pigment paste with the aqueous dispersion of film-forming. Steps 2 and 3 is carried out on the same equipment as for getting enamels. In If the preparation of certain epoxy water-based paints suspension of pigment in the oligomer is emulsified in an aqueous solution hardener immediately prior to use paint.